The temperature on April 7, 1883 was about 7.4 °C. The air pressure was 3 kgf/m2 and came mainly from the north-northeast. The airpressure was 78 cm mercury. The atmospheric humidity was 94%. Source: KNMI
In The Netherlands , there was from August 20, 1879 to April 23, 1883 the cabinet Van Lijnden van Sandenburg, with Mr. C.Th. baron Van Lijnden van Sandenburg (conservatief-AR) as prime minister.
In The Netherlands , there was from April 23, 1884 to April 21, 1888 the cabinet Heemskerk, with Mr. J. Heemskerk Azn. (conservatief) as prime minister.
January 19 » The first electric lighting system employing overhead wires, built by Thomas Edison, begins service at Roselle, New Jersey.
May 24 » The Brooklyn Bridge in New York City is opened to traffic after 14 years of construction.
August 25 » France and Viet Nam sign the Treaty of Huế, recognizing a French protectorate over Annam and Tonkin.
November 18 » American and Canadian railroads institute five standard continental time zones, ending the confusion of thousands of local times.
November 30 » The style of western calendar, Common Era is conveyed to Joseon (Early-Modern Korean kingdom]].
December 16 » Tonkin Campaign: French forces capture the Sơn Tây citadel.
Day of death June 12, 1970
The temperature on June 12, 1970 was between 9.9 °C and 22.3 °C and averaged 16.6 °C. There was 11.6 hours of sunshine (70%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the north-northwest. Source: KNMI
May 31 » The 7.9 Mw Ancash earthquake shakes Peru with a maximum Mercalli intensity of VIII (Severe) and a landslide buries the town of Yungay, Peru. Between 66,794–70,000 were killed and 50,000 were injured.
November 14 » Southern Airways Flight 932 crashes in the mountains near Huntington, West Virginia, killing 75, including almost all of the Marshall University football team.
November 21 » Vietnam War: Operation Ivory Coast: A joint United States Air Force and Army team raids the Sơn Tây prisoner-of-war camp in an attempt to free American prisoners of war thought to be held there.
December 2 » The United States Environmental Protection Agency begins operations.
December 15 » Soviet spacecraft Venera 7 successfully lands on Venus. It is the first successful soft landing on another planet.
When copying data from this family tree, please include a reference to the origin: Hans Opperman, "Family tree Opperman", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-opperman/I3412.php : accessed January 8, 2026), "Sybren Yntema (1883-1970)".
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